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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
In iron deficiency anemia, the red cells appear abnormal and are unusually small (microcytic) and pale (hypochromic). The pallor of the red cells reflects their low hemoglobin content. The prevalence of iron deficiency anemia spans all ages and races. In children, iron deficiency causes developmental delays, behavioral disturbances, failure to thrive (grow) and increased infections. Iron deficiency is a major problem in developed countries such as the US, Canada, the UK and across Europe.